Suction roll for papermaking machines



June 18, 1940. w. THALER 2,204,780

SUCTION ROLL I08 PAPERIAKING MACHINES Filld Nov. 4, 1937 Fig. 4

n 2 v 4 A n K i H F I 6 Z-Sheets-Sheet l i I E June 18, 1940. w THALER 2,204,780

SUCTION ROLL FOR PAPERMAKING MACHINES Filed Nov. 4, 1937 2 SheetsSheet 2 M U? W ATTolN Patented June 18, 1940 UNITED STATES PATENT OFFICE 2,204,780 SUCTION ROLL FOR PAPERMAKING MACHINES Wilhelm Thaler, Heidenheim-on-the-Brenz, Germany, assignor to American Voith a corporation of New Application November 4,

In Germany November 1 Claim.

relates to suction rolls for papermaking machines. More particularly, the invention relates to such rolls having a plurality This invention wall, and a suction connection.

The object of the invention is to provide in such structures suitable means for varying the width of the suction area of the roll.

papermaking machine. Y

Also, proposals'torcontrol each of the cells have resulted in certain disadvantageous features in the operation thereof.

This invention consists essentially in the procurnference of the outer suitable sealing devices.

ends open Cel rted by the roll, isposed and radially placed Around the roll A with its cell posed cells B, and Walls or partitions circumferentially d upon said roll A.

Contact 00.

1937, Serial No. 172,692

walls C and cells B, an outer wall D. provided with a large number of openings, is

walls C. The suction heads E channels F are stationary,

with the suction whereas the cell roll l A is supported by and rotated by the shaft L supported in a suitable of a standard L v The parts which have just been described are. in general, well-known, and for and in themselves form no part of this invention.

The invention beyond the roller the extended a space is provided of the roll.

drawings, and, as seen 1n Figure 1, is of substantially rectangular cross-section, determined by the distance between the inner surface of the"- form part of the Wall J. Beyond these flanges P and P circumferentially considered and asseen in Figure 2, extensions Q and Q of the wall J are provided, between which extensions Q and Q and radial flanges P and P sealing means M are inserted to act upon the inner surface of the foraminated extension wall D.

The member G is provided with screw threaded ll suction space both parts engaged by spindles K which have collarfs K and K at each end of flanges K of the wall J, and these spindles K extend outwardly of another flange K, and at the outer side of the flange K a toothed wheel K is keyed to the spindle K. A chain, not shown in the drawings as the same is well-known for purposes of this kind, suitably passes over the wheel K and by the movement of the chain as many spindles K as are provided are simultaneously rotated, and by such rotation move either inwardly or outwardly the member G. In the drawings, Figure 2, three spindles K are shown. Other means for simultaneously operating as many spindles as may be utilized, may be provided.

This member G which might be described as a slide for the width and which is movable along the inner surface H of the extended foraminated wall D and along the outer surface of the wall J in a direction parallel to the axis of the shaft L, said movability being longitudinal of the axis of the shaft L, determines the boundary of the in width in respect to the desired working width, which does not necessitate the use of certain of the openings of the foraminated wall D and of the exterior air. In other words, the member G acts as a wall operative upon the one hand upon the suction, and on the other hand upon the exterior air.

The member G is so formed from a cut out of a ring or annulus whose measurements in the circumferential direction are such that these measurements correspond to the suction zone of the suction channels E. The adjustment of the member G to the desired working width of the outer wall may be readily carried out by the means described or by other suitable means. In the case where the suction channels extend over a greater are of the suction cell roller A, the slide G may be provided either with the number of spindles K shown in Figure 2, or a larger number thereof, all of which spindles may be operated by suitable chain actuating means, or the like.

For the purpose of providing a sealing between the rotating roll A with its suction cells B on the one hand, and the suction channel F and the lateral sealing of the suction chambers on the other hand, suitable sealing members of a wellknown type may be applied, these being generally indicated by M In respect to the present invention, it is without importance whether the regulating device G is provided at one or both sides of the cell roller A, and whether or not suction heads E are provided at one or both sides thereof.

The device, in accordance with the invention, permits the suction width of the outer wall surface to be longitudinally adapted to and easily adjusted in respect to the desired paper format, so that the suction losses and ineificient production products are prevented. The slide G makes it possible, in addition to its disposition in respect to the just mentioned selected paper width of stock, to adjust the same during the operation of the papermaking machine.

It is obvious that various changes and modifications may be made in the details of construc tion and design of the above specifically described embodiments of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claim.

I claim:

In a suction roll for paperrnaking machines having a foraminated outer wall, a cell roll therein having longitudinal cells over the entire circumference, and spaced inwardly of the outer wall, and a closure member extending circumferentially around one end of the cell roll for closing the ends of the cells and having an opening of a length substantially equal to a quadrant of the circumference of the cell roll and of a depth substantially equal to the depth of the cells, combined with radially disposed stationary walls spaced apart the distance of said quadrant and extending longitudinally of and within the outer Wall, a wall concentric with and spaced from the outer wall and connecting said spaced longitudinal walls, adjustable valve member means closing the space formed by said longitudinal walls, said outer wall, and said concentric wall from the atmosphere, and suction conduit means spaced between said longitudinal walls for acting upon the cells of the cell roll as they rotate and pass the quadrant opening of the closure member and for acting upon the space formed by said longitudinal walls, said outer wall, and said concentric wall between the cells and the valve means, to subject them to a common and substantially uniform suction action.

WILHELM THALER. 

